Magnetic chuck



Filed Aug. 6, 1923 .iis VV f/f f .TAV ila .Y wr E E .4 2 61| l l l l l.lll

. i Ewen/ai'.- cfl'n Aug. 4, l1925. 1,548,793

J. BING MAGNETIC CHUCK Filed Aug. 6, 1923 2 Sheets-Sheet 2 l z/ f 5 2 73 20 2 a l 27 32.2 a 49 I .J7/'Waffen' JBJ'Iz/y Patented Aug. 4, 1925.

i UNITED STATES JULIUS BING, Ol EISENACH, GERMANY.

MAGNETIC CHUCK.

Application led lAugust 6, 1923.

To all toll/m t may concern.:

Be it known that I, JULiUs BING, a citizen of the German Empire,residing at 18 Fischweide, Eisenach, Germany, have invented certain newand useful Improve ments in Magnetic Chucks, of which the following is aspecification.

My invention relates to improvements in magnetic chucks. Magnetic chuckssuch as are now in use are made from cast steel or gray iron blocks thedimensions oi which correspond to the desired size of the chuck.Therefore numerous blocks of different sizes must be kept in storecorresponding to apparatus of the desired sizes or types, which causeshigh running expenses. rThe object of the improvements is to reduce therunning expenses by composing electromagnetic chucks of different sizesand forms trom a small number of standard cast iron or cast steelblocks. 1n the practice of the invention compose the chucks from threeor more parts, the median part being the main body of the chuck andconsisting` of magnetic material and being substantialiy of evencross-section throughout its length. Guly a small number of such mainbodies need be kept in store, all of the said bodies being distinguishedsubstantially by their cross-sections. According to the desired size ofthe chuck a main body of the proper cross-section is taken, which isreduced to the length corresponding to the desired form of the chuck.Thereafter the magnetic coil is placed into the cut-out parts of thebody, caps are secured to the open ends ot the boty, and finally a coveris placed on the parts, which can readily be cut to the proper length. l

1n order that my invention be more clearly understood an exampleembodying the same has been shown in the accompanying drawings, in whichthe same reference characters have been used in all the views toindicate corresponding parts. In said drawings,

Fig. 1, is an elevation partly in section showing the chuck with themedian part broken away,

Fig. 2, is a top plan view partly in section,

Fig. 3, is a vertical cross-section taken on the line 3-3 of Fig. 1, and

Figs. 4 and 5, are elevations on a reduced scale showing two chucks ofdifferent lengths, the median parts being cut from the same cast ironblock.

Serial No. 656,089.

1n the example shown in the figures the body of the chuck is made inthree sections, a median section 1 and two end sections 2 and 3 in theform of caps. The median section consists of a body of magnetizablematerial suchas cast steel or gray iron in the form of the letter m7 andhaving a web or body portion 4, flange portions 6, 6 and a core 5, thecross-section of the body being substantially the same all over thelength thereof. The flange portions 6, 6 and the core have the sameheight.

The end portions 2 and 3 are made from non-magnetic material such asbrass or aluminum and they are in the form of semicylindrical capshaving their open sides at the sides of the body 1 and equipped withflanges 7 and 8. The end portion 3 is foi-ined with a tubular portion 9projecting outwardly and in the direction of the longitudinal axis andhaving a cylindrical cap 10 secured thereto. Fitted in and insulatedfrom the bottom of said box are two contact pins 1l having the terminals12, 12 of a magnetic coil 13 secured thereto. As shown the said coil isenclosed within a. waterproof sheath made for example from a lead platehaving its seams soldered and formed with a tubular portion 15 passedthrough the tubular portion 9 and having a flange 16 clamped in a tightway between a flange 17 of the member 10 and the adjacent margin of theportion 9 by means of screws 18.

1n assembling the chuck the coil 13 embedded within the sheath 1K1 isplaced around the core 5 and between the same and the flanges 5, and aplate 19 having the same length and the same breadth as the body 1 isplaced on the same, which plate consists of two outer portions 20, 2Oand an inner portion 21 both of magnetic material and correspondingrespectively to the flanges 6, 6 and the core 5, and of narrow lamellte22 and 23 fitted between the said portions 2O and 21 and alternatelymade from magnetic and non-magnetic material. rlhe portions 20, 21 and22, 23 are ina-de from standard bars cut in each case to the lengthcorresponding 'to the type of the chuck, and they are connected witheach other by bolts 27. rThe caps 2 and 3 are secured to the body 1 andthe top plate 19 respectively by means of screws 21- and 25, and the topplate is fixed in position by means of screw bolts` passed through thecore 5. 1f it is desired to manufacture a chuck of the saine breadth,which, horvever, is reduced in length, l reduce a standard body l inlength by cutting therefrom a part of its length and I place thereon acoil 155 of reduced length. Further, the plate 1 9 is made from stripsor lamellze cut Vfrom the standard bars to the proper length. Theremaining parts generally need not be changed in forni, with theexception that the vertical corners of the core 5 at the :tace of thecut preferably will be rounded as indicated at 29 in Fig. 2.

It will be understood that by lineans of a feiv lcastings of standardVsize a large number of chucks of different sizes may be manufactured,whereby the expenses oit the manufacture are considerably reduced.

I' claim:

l. An electro-magnetic chuck, consisting of a` channel-like body otmagnetizable material formed With a web between the chaunel flanges andhaving substantially the saine cross section all over its length,electric energizing means Within said body, a pole piece composed ofmagnetizable and non-magnetic portions, secured to the flanges and theWeb of said body, coil covering caps secured to the end faces ot saidbody, and means tor leading` electric current to said' energizing means.

2. An electro-magnetic chuck, comprising an iron body formed withlateral flanges and a core portion between said flanges, said flangesand core projecting 'from the body to the same side and thecross-sections oit said body together with said flanges and core portionall over the length off the body having substantially the sameconfiguration, an

electric coil mounted on said core portion, aslab-like pole piece havingsubstantially the length of said body covering the flanges andcorcportion of the body, and caps sccured to the end faces of said body torcorering the coil.

8. An electro-magnetic chuck, comprising a body olf magnetizablematerial having flange and core portions projecting to the saine sideand having the saine cross-section throughout its length, an electriccoil mounted on said core portion, a pole piefe r composed oit'inagnetizable and non-magnetic portions and connecting the flange andcore portions of said body, and caps secured to the end faces of saidflanges and oll said pole piece for covering the coil.

l. An electro-magnetic chuck, compi" ci" a body of magnetizable materialhaving 'flange and core portions projecting to the saine side and havingthe saine cross-section throughout :its length, an electric coil mountedon said core portion, a pole piece composed of magnetizalile andnonen'iagnetic portions and connecting the flange and core portions ofsaid body, and semicylindrical caps secured to the end faces of saidflanges and el? said pole piece tor cwering the coil, one of' said capsbeing jlorined with a tubular portion having the terminals ot' said coilpassed theretln'ough.

ln testimony I aflix my signature in presence ot two Witnesses.

JULIUS BING'.

litnesse RUDOLPH Fnioin, VILLY e Srrnn.

